public unsafe static AudioChannelLayoutTag[] GetTagsForNumberOfChannels(int count)
{
const int type_size = sizeof(uint);
int size;
if (AudioFormatPropertyNative.AudioFormatGetPropertyInfo(AudioFormatProperty.TagsForNumberOfChannels, type_size, ref count, out size) != 0)
{
return(null);
}
var data = new AudioChannelLayoutTag[size / type_size];
fixed(AudioChannelLayoutTag *ptr = data)
{
var res = AudioFormatPropertyNative.AudioFormatGetProperty(AudioFormatProperty.TagsForNumberOfChannels, type_size, ref count, ref size, (int *)ptr);
if (res != 0)
{
return(null);
}
return(data);
}
}
public unsafe static AudioChannelLayoutTag[] GetAvailableEncodeChannelLayoutTags(AudioStreamBasicDescription format)
{
var type_size = sizeof(AudioStreamBasicDescription);
uint size;
if (AudioFormatPropertyNative.AudioFormatGetPropertyInfo(AudioFormatProperty.AvailableEncodeChannelLayoutTags, type_size, ref format, out size) != 0)
{
return(null);
}
var data = new AudioChannelLayoutTag[size / sizeof(AudioChannelLayoutTag)];
fixed(AudioChannelLayoutTag *ptr = data)
{
var res = AudioFormatPropertyNative.AudioFormatGetProperty(AudioFormatProperty.AvailableEncodeChannelLayoutTags, type_size, ref format, ref size, (int *)ptr);
if (res != 0)
{
return(null);
}
return(data);
}
}
public unsafe static AudioFormat?GetFirstPlayableFormat(AudioFormat[] formatList)
{
if (formatList == null)
{
throw new ArgumentNullException("formatList");
}
if (formatList.Length < 2)
{
throw new ArgumentException("formatList");
fixed(AudioFormat *item = &formatList[0])
{
uint index;
int size = sizeof(uint);
var ptr_size = sizeof(AudioFormat) * formatList.Length;
if (AudioFormatPropertyNative.AudioFormatGetProperty(AudioFormatProperty.FirstPlayableFormatFromList, ptr_size, item, ref size, out index) != 0)
{
return(null);
}
return(formatList [index]);
}
}
